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Technical Zone

1.3k Topics 11.5k Posts
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  • Suspension Related
    100 768
    100 Topics
    768 Posts
    HOTSHOT IIIH
    @reudtr88 The seller is right, the spacers and caliper bracket are narrower than the DT125R versions. The bench mock-up in the pics above comprised a 3ET DT200R swingarm, caliper hanger and spacers mated to a DT125R hub. As you can see the 428 sprockets lined up quite well (I also had to use a 3mm thick M20 washer between the caliper hanger and swingarm to get it as good as it could possibly be with the items I had to hand).

  • Exhaust Related
    64 569
    64 Topics
    569 Posts
    D
    as far as i m aware there are 3 different types of tzr the first model series 2 (RR) an tzr125r sp i have an exhaust with the code 4DL E46 10 20 what model is it intended for

  • Framework Related
    86 606
    86 Topics
    606 Posts
    CalumC
    That's normal. All DTs are like that. [image: IMG-20251011-114625.jpg]

  • Wheel Related
    83 747
    83 Topics
    747 Posts
    R
    Check that the front wheel is centered in the fork, that should be enough. There should be no binding in the fork since one side is just a clamp.

  • Electric Related
    265 2k
    265 Topics
    2k Posts
    CalumC
    I'm sure someone here will be able to point you in the right direction. What we've been seeing in recent times are a lot of DTRs being imported from Europe, these can come with subtle differences, this may be the case here. This is the 3NC wiring diagram. [image: 52172141696_84e3b69382_b.jpg] I only have a Haynes manual so can't speak for what other diagrams look like. I have also hosted the workshop manuals here: https://dt125r.co.uk/topic/3258/yamaha-dt125r-200r-workshop-manual https://training.dt125r.co.uk/files/Yamaha_DT125_Workshop_Manual.pdf This may be useful.

  • Brake Related
    68 453
    68 Topics
    453 Posts
    CalumC
    Yeah that sounds like a good idea and should be easy to swap the wheels over without too much faff!

  • Engine Related
    545 5k
    545 Topics
    5k Posts
    H
    Got it, thanks for your help everyone. Was planning to have a go but then had an episode and ended up in hospital. Now I'm back in the game.
  • declanD

    Snorkel out flat power curve?

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    1k Views
    J
    Removing the snorkel affects the jetting, so jet accordingly. It can also decrese the low end a bit, as theres not much velocity through the carb when you whack the throttle open at low speed. IMO the airbox seems pretty restrictive, so removing the snorkel adds tons of air. You can be both rich and lean, as in lean in the midrange, and rich on the mainjet, or the other way around.
  • Bilbo25ukB

    Chain roller problem

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    Yamboy46Y
    Cheers calum got that sorted now bud. Thankyou
  • declanD

    Pv adjustment help

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    42 Posts
    9k Views
    J
    Is the servo disconnected? They can act up aswell due to corrosion and such.
  • declanD

    Carb clean abs rebuild help

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    33 Posts
    6k Views
    F
    Ahh fair enough then. Every bike is different lol
  • D

    What is causing my bike to overheat?

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    13 Posts
    3k Views
    D
    You guys have given me a lot to work with... No, I definitely won't be riding it anywhere when it's running like this. I'll print off this whole thread and show it to my friend who knows a lot more about bikes than me... Thanks
  • declanD

    Bleeding hydraulic clutch?

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    Glynn123G
    Will have a shot of it over this winter, got big plans for the old DT in the next few months so will report back
  • declanD

    Coolant overflow leaking

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    25 Posts
    7k Views
    CalumC
    @irongamer727 You probably won't gain higher revs, as unfortunately, the ability to rev higher is lost with the bigger bore. But yes, you will be able to dial in the ignition much more towards the bigger cylinder. I'd have thought there would be some nice gains with this and the bigger bore.
  • declanD

    Redlining issue?

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    42 Posts
    8k Views
    declanD
    @ninja that’s better!
  • declanD

    Bike running fast revs

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    52 Posts
    10k Views
    declanD
    @scrimsmustang it seems to be sorted now put a stiffer spring in
  • O

    Inlet rubber3bn/3et

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    0 Votes
    31 Posts
    7k Views
    declanD
    @ricky0115 don’t use rtv silicone it ends up in your reed cage
  • declanD

    Engine swaps for dummies!

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    13 Posts
    3k Views
    ZrakoZ
    @perithtv I've been there too few months ago. Soaking , heating etc etc nothing Take off everything possible what can restrict you in the back and chop the bolt on as much places as angle grinder let you. I had 4 cuts and lifted the pieces off. Bought brand new guts for it and there is more grease then metal on it 😂 damaged my axe on it too 😁
  • D

    DTR 2003 Replacement Carb?

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    J
    When I bought my bike carb was leaking from overflow pipe all the time, when tank valve was open. I opened the carb and the reason was that, the float valve was upside down! I turn it to right way and overflow stop immediately!!! Check that!
  • declanD

    Oiled filters

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    6 Posts
    1k Views
    J
    Cant see why you wouldt want to get better filtration... Airfilter oil is pretty cheap, and the filter is made to flow this way. Youd' be surprised how much crap it catches when you clean it.
  • declanD

    Fuel additive safe for 2 strokes

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    9 Posts
    2k Views
    declanD
    @Calum ??
  • A

    Power Valve set up

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    4 Posts
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    declanD
    @Zrako when I rebuilt my bike my servo would get stuck when turning on the ignition how ever I kept turning the key and it sorted its self out no problem
  • D

    Strange yvps

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    3 Posts
    1k Views
    D
    It says 3nc-00 on cdi
  • declanD

    Lingering revs and no running without choke

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    13 Posts
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    declanD
    @Calum thanks! What revs do the the dts go to on full choke
  • K

    YVPS.

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    19 Posts
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    CalumC
    @Mightyman Nah the DTRE's were given full YPVS servos. Although you make a good point, the YPVS does shut off at 10'000 rpm as a restriction. But the point here is the build up of NoX's gases. So whilst they did shut off, the normal person would be part throttle anyway. And if you were pinning it, well you would expect it to give up eventually and this might be why.
  • declanD

    Missing oil pump nipple need help!

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    declanD
    @jgr72 if I remember I'll look at my other bike it might have the size of pipe printed on it
  • declanD

    How do you break in your fresh re bores

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    14 Posts
    3k Views
    declanD
    @Calum figured so thanks